JavaScript Support Engineer
Sigma Software · Warsaw, Masovian Voivodeship, Poland
Software Development · 1,001-5,000 employees
About the role
You will implement and maintain website and ESP integrations while developing custom JavaScript functionality for onsite campaigns. Additionally, you will troubleshoot production issues and collaborate with cross-functional teams to ensure reliable data synchronization workflows.
What they look for
Requirements
The role requires at least 2 years of commercial experience with Vanilla JavaScript, HTML, and CSS. Candidates must also possess strong analytical skills and practical experience with REST API integrations and browser debugging tools.
Benefits
Full description
Company Description
We are looking for a JavaScript Support Engineer to join a dynamic AdTech project focused on behavioral analytics and marketing automation.
At Sigma Software, you will work on scalable integrations connecting websites, marketing platforms, and real-time customer engagement systems. This role combines Front-end development, API integrations, troubleshooting, and collaboration with international teams.
We as a company offer a supportive engineering culture, opportunities for professional growth, and the chance to work with modern AdTech and marketing automation technologies while contributing directly to customer success.
CUSTOMER
Our partner is a fast-growing AdTech company helping brands identify and engage anonymous website visitors through behavioral intelligence and marketing automation. The platform transforms browsing behavior into actionable insights, enabling personalized campaigns across email, SMS, and paid advertising channels. The solution supports businesses in improving conversion rates, customer engagement, and revenue growth through scalable data-driven marketing strategies.
PROJECT
The project focuses on developing and maintaining integrations between the AdTech platform and customer ecosystems, including websites, Email Service Providers, and marketing automation tools. The team delivers behavioral tracking solutions, onboarding processes, real-time event pipelines, and personalized onsite experiences for international customers.
You will participate in integration development, technical troubleshooting, migration activities, and implementation of custom JavaScript solutions for marketing campaigns and data synchronization workflows.
Job Description
- Implement and maintain website and ESP integrations
- Configure event tracking, customer data synchronization, and identity resolution workflows
- Develop custom JavaScript functionality for onsite campaigns and personalized customer experiences
- Support ESP migrations and third-party platform integrations
- Build and maintain data integration workflows and automation processes
- Troubleshoot production issues, identify root causes, and deliver reliable solutions
- Assess technical feasibility of new requirements and provide implementation estimates
- Collaborate with clients and cross-functional teams during onboarding and ongoing support
- Contribute to technical documentation and integration best practices
Qualifications
- 2+ years of commercial experience with Vanilla JavaScript (ECMAScript 5+)
- Solid knowledge of HTML and CSS
- Hands-on experience with REST API integrations
- Practical experience with jQuery
- Experience with Chrome DevTools and browser debugging
- Knowledge of Email Service Provider integration workflows
- Ability to develop custom JavaScript logic for onsite experiences
- Strong analytical and problem-solving skills
- Good communication skills with technical and non-technical stakeholders
- Attention to detail and commitment to code quality
- Experience working in cross-functional teams
- Upper-Intermediate English level
WOULD BE A PLUS
- Knowledge of Apache Airflow or data pipeline orchestration tools
- Experience with Postman and API testing
- Familiarity with Git and version control practices
- Basic PHP knowledge
- Familiarity with Looker or similar reporting and analytics tools
